Dental flask.



. No. 706,0l6. Patentea'Aug. 5, |902.

F. A. BREWER, JR. &, G. W. HARVEY.

DENTAL FLASK.

(Application filed Nov, 21. 1901.)

(No Model.)

UNITED STATES PATENT EEICE.

FRANK A. BREWER, JR., AND GEORGE W. HARVEY, OE WATsONvILLE, CALIFORNIA.

DENTAL FLASK.

SPECIFICATION forming part 0f Letters Patent N0. '70 6,016, dated August 5, 1902.

Application filed November 21, 1.901. Serial No. 83,136. (,No model.)

T0 all 'tz/71,0171, t may concern:

Be it known that we, FRANK A. BREWER, Jr., and GEORGE W. HARVEY, citizens of the United States, residing at W'atsonville, in the county of Santa Cruz and State of California, have invented certain new and useful Improvements in Dental Flasks; and we do declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to dental flasks for the use of dentists for vulcanizing plates expeditiously without the aid of flask-presses or bolts.

The object ofthe invention is to provide a flask of this character which shall be simple of construction, durable in use, comparatively inexpensive of production, and by means of which the operation of opening and closing may be speedily and effectually accomplished without soiling or burning the hands with the flask and at the same time doaway with all ilaskpresses, bolts and nuts, stirrups, lugs, or other like devices which re- 'quire a press.

With these and other objects in view the invention consists of certain novel features of construction, combination, and arrangement of parts which will be hereinafter more fully described, and particularly pointed out in the appended claims.

-In the accompanying drawings, Figure lis a perspective View showing the parts constituting the flask arranged one above the other.

Fig. '2 is a longitudinal sectional view whenl the parts are connected. Fig. 3 is a detail perspective view of the Wrench. Fig. 4 represents a holding device, and Fig. is a sectional view through one of the arms of the holding device.

Referring to the drawings, 1 denotes the bottom of the flask, which is castintegral with the lower ring 2, which is externally screw-threaded and is provided on its upper end with tapering lugs 3.

4 denotes the upper ri-ng, which is adapted to iit upon the upper end of the lower ring and is provided in its sides with diametrically opposite tapering recesses 5, which receive the studs 3 and serve to center the ring 4 when slipped into engagement with the ring 2, as well as to prevent a turning or torsional movement of the two rings one with respect to the other. The upper end of the ring 4 is provided with recesses or notches 6, which receive lugs 7of the top of the flask 8, which lits upon the top of the 'ring 4. The top S upon its upper face is provided with an annular flange 9, which serves to stiften and to increase the strength of the top, as well as to provide a bearing-surface and distribute the pressure of a fenestrated locking cap 10, which is provided at its lower end with screwthreads 11 to engage the screw-threads of the lower ring 2. The top is also provided with escape-openings 12 to permit of the escape of excess plaster.

It will be seen by referring to Fig. 2 of the drawings that when the parts yare assembled and the cap 10 screwed tightly down the parts constituting the flask will be securely retained in position.

Any suitable means may be employed for locking or unlocking the parts of the flask;

but those shown are preferred, and consist of a Spanner-Wrench 13, which is adapted to engage holes 14, formed in the sides of the screw-cap, and to be supported by lugs 15, cast integral with the sides of the screw-cap and arranged immediately below the holes. While screwing or unscrewing the cap it is of course desirable to hold the bottom of the mold stationary. Ay simpleway of accom plishing this is to provide a holding device in the form of a spider (shown in Fig. 4,) consisting of bars 14', having beveled or undercut sides, withwhich are engaged the beveled or undercut lugs 15', cast integral with the bottom of the mold. It is eviden-t that when the lugs 15 are engaged with the spider and the Wrench applied all danger'. or liability of the flask slipping is over-com e, as the torsional movement of the bottom of the flask is prevented by the spider-arms, while all upengaged when it is desired to lift the tiiask when it is in a heated condition.'

From the foregoing description, taken inv connection with the accompanying drawings, the construction, mode of operation, and advantages of the invention will be readiiyunderstood Without requiring a more extended explanation.

Various changes in the form, proportion, and details of construction may be made within the scope of the invention without departing from the spirit or sacrificing any of the advantages thereof.

Having thus described our invention, what We claim, and desire to secu re by Letters Patent, is

1. A dental iiask comprising a bottom, two rings, one of which is integral with the bottom, and a top, in combination with a cap having a screw-threaded connection with the ring integral with the bottom, for locking the parts of the ia'sk together, substantially as set forth.

2. dental flask comprising a bottom, two rings and a top, one ring being integral With the bottom and being provided with external screw-threads, in combination with a cap surrounding the top or the upper ring and provided with screwthreads to engage said screw threaded ring, substantially as set 3o forth.

3. A dental ask comprising a bottom, two rings and a top, one ring being iixed to the bottom and provided with lugs to engage recesses in the other ring, in combination with 35 a screw-threaded cap for clamping the parts together, substantiallyas set forth.

4. The combination with a dental iask, the bottom of which is provided with lugs, of a spider to engage the said ings, a screw-cap to 4o clamp the parts of the ask together, and a Spanner-Wrench to engage the screw-cap, subi stantiaiiy as set forth.

In testimony whereof we have hereunto set our hands in presence of two subscribing Wit-v 45 nesses.

FRANK A. BREWEaJi-t GEORGE W. HARVEY.

Witnesses:

A. W. SAUs, WM. SANDHOLD. 

